Power Capability Detection In Precision Power Level Control Systems For Wireless Power Transmission

A base station for wireless power transfer at an operating frequency, the base station comprising a power transmitter that comprises:

• an inverter circuit configured to receive a direct current (DC) input power from an external power supply and convert the DC input power to an alternating current (AC) wireless power signal;
• a coil configured to transmit the AC wireless power signal at the operating frequency to a power receiver, the coil formed of wound Litz wire and including at least one layer;
• a controller comprising:
• at least one processor;
• at least one machine-readable medium;
• and
• program instructions stored on the at least one machine-readable medium which, when executed by the at least one processor, cause the controller to:
• provide a power request to an external power supply for the DC input power at or above a power level for the power transmitter to provide the AC wireless power signal to the power receiver;
• provide a driving signal to the inverter circuit for generating the AC wireless power signal;
• monitor the AC wireless power signal at the coil, the AC wireless power signal based on the driving signal;
• determine that the monitored AC wireless power signal at the coil is compliant with the power request;
• based on determining that the monitored AC wireless power signal at the coil is compliant with the power request, verify power compliance for the external power supply and continue to operate for wireless power transmission;
• determine that the AC wireless power signal is non-compliant with the power request;
• based on determining that the monitored AC wireless power signal at the coil is non-compliant with the power request, store a flag of non-compliance for the external power supply;
• and
• determine if the flag of non-compliance was caused by a shutdown of the power transmitter or a brownout of the power transmitter.